Captain? Jeff,

Numbers 1 through 3 are possible, I do not believe 4 & 5 could possibly have
anything to do with coolant in the oil. Without more info I would suspect
first the blown head gasket. It would not take much oil in the coolant to
be significant in an analysis.

I would be curious as to where the oil is around a frost/freeze plug that it
could get into the oil.

Capt. Rich
"Tamaroak" wrote in message
...
I recently had an oil analysis done after changing my oil before winter.
They found a significant amount of antifreeze backed up by my having to
add some during the last part of the season. It's a 1987 5.7L GMC with
closed cooling and 770 hours. It uses no oil and runs great.

I'm trying to determine the possible causes. I've heard:
1. Cracked block
2. Cracked head
3. Bad head gasket
4. Bad frost plug
5. Bad coolant pump (supposedly located on pop of the engine by the
manifold)

Any other ideas?

Capt. jeff




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